Yarn texturizing apparatus and process

ABSTRACT

Apparatus and process for preventing the individual wraps of yarn from entangling as multiple wraps of a continuous length of yarn is texturized at high speeds by guiding the yarn under controlled tension and temperature in frictional engagement with a texturizing element which advances in the same direction as, but at different relative speeds with respect to, the moving yarn.

O United States Patent 1191 1111 3,724,039

Li et al. 1451 Apr. 3, 1973 [54] YARN TEXTURIZING APPARATUS [56]References Cited AND PROCESS UNITED STATES PATENTS [75] Invemm: LangParsiPPaW; 2,553 127 5/1951 Barker .......2s/71.3 Prevomk, 2,622,182 121952 Forzleg et 31.... ..28/62 x York Rothmayer, Madison, al of2,921,358 H1960 Cox et al. ..28/l.5 NJ. 3,619,874 11/1971 Li et al...28/1.5

[73] Assignee: Allied Chemical Corporation, New Primary Examiner LouisK. Rimmdt York Attorney-Arthur J. Plantamura et al. [22] Filed: Apr. 12,1971 [57] ABSTRACT [21] Appl. N0.: 133,054

Apparatus and process for preventing the individual wraps of yarn fromentangling as multiple wraps of a [52] US. Cl ..28/L5, 28/7213 ontinuouslength of yarn is texturized at high speeds [51] Int. Cl. ..D02g 1/10 byguiding the yarn under controlled tension and tem- [58] Field of Search..28/l.5, 1.3, 62, 71.3, 72.13, perature in frictional engagement with atexturizing element which advances in the same direction as, but

at different relative speeds with respect to, the moving yarn.

12 Claims, 10 Drawing Figures PAINTED 7 3,724,039 sum 1 OF 2 INVENTORSHSIN G Ll D N REV EK N Y. ROTHM R TORNEY PATENTEIJAPR3 ma 3.724.039

SHEET 2 OF 2 INVE RS HSIN LAN DUSAN C. PREVOR K NOEL Y. ROTHMAY WWWTORNEY 1 YARN TEXTURIZING APPARATUS AND PROCESS BACKGROUND OF THEINVENTION This invention relates to apparatus and process for makingtextured textile yarns by drawing the yarn at a relatively greater speedthan, and in engagement with, a rotating texturizing element asdisclosed in the pending commonly assigned US. Pat. application of Li,et al. Ser. No. 3,444 filed on Jan. 16, 1970 now US. Pat. No. 3,619,874,and more particularly with a device comprising an improvement thereoverwhich substantially lessens entanglement and breakage of the yarn.

While it has been known for many years that a thermoplastic yarn drawnunder tension in a sharp angular path about a stationary edge positionedat the apex of the angle will impart texture to said yarn, as disclosedfor example in US. Pat. Nos. 2,919,543; 2,921,358; 3,025,584; and3,325,988, the use of a texturizing element which moves in the directionof travel of the yarn as thereby permits substantially increasedprocessing speeds as disclosed in said application US. Pat. No.3,619,874 is a fairly recent development. In processing with therotating texturizing element as disclosed in said application US. Pat.No. 3,619,874, a plurality of wraps, e.g., sometimes 50 or 100 or morewraps, of the yarn may be employed to provide the desired texture on theyarn. These relatively higher speeds and multiple wrapping around thetexturizing element may result in increased tendency for the yarn totangle and break. The aim of the present invention is to afford a novelarrangement which uniformly advances the yarn along the length of thetexturizing element and substantially lessens entanglement of the yarn.

SUMMARY OF THE INVENTION We have discovered that the entanglement andbreakage problems can be overcome by providing means to keep each of theindividual wraps or windings of the many wraps of yarn continuouslymoving away from a prior wrap and thereby prevent one winding of theyarn from overlapping a prior winding. This separation of windings iseffected by a suitable configuration, properly disposed, of thetexturizing element and/or a rotating driven godet or helical screw orother inclined feed advance means which effects a lateral movement ofeach of the several windings of the yarn so that it does not interferewith a subsequent winding.

In essence, the apparatus comprises a rotating texturizing element,e.g., a blade or taut wire, over which a plurality of wraps of the yarnare frictionally drawn and which moves in the same direction as the yarnand whose rate of movement is coordinated or synchronized with themovement of the yarn and a lateral feed means which may include aninclined texturizing blade, a tapered godet roll, or a helical screw topreclude substantial overlap ofsubsequent wraps of yarn which are woundaround the rotating texturizer.

It is an object of the invention to provide a novel method and anapparatus for preventing entanglement of yarn in the production oftexturized thermoplastic yarn by wrapping said yarn a plurality of timesaround a rotating texturizing element and the rotating driven godet.

The foregoing and additional objects are accomplished by means of anarrangement that progressively feeds the yarn laterally while undertension so that prior wraps are advanced laterally and are therebydisplaced from the position where they initially engage the texturizingelement or godet so that subsequent wraps are not superimposed; thisseparates the several wraps and substantially lessens the tendency foryarn entanglement.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be describedwith reference to the accompanying drawings in which:

FIG. la and FIG. 1b represent a schematic side view and an end viewrespectively of one embodiment of the invention illustrating a tiltedtexturizing element, as well as an optional separator roller to aid inseparating the individual wraps of the yarn around the texturizingapparatus;

FIG. 2 represents a schematic side view of another embodiment of theinvention in which the surface of the godet is treated to effectvariation of frictional characteristics;

FIG. 3 represents a schematic side view of still another embodiment ofthe invention in which a separator screw is utilized in conjunction witha rotating texturizing element to accomplish yarn separation;

FIG. 4 represents a schematic side view of still another embodiment inwhich the yarn wraps are kept separate by means of a rotating tapereddriven godet,

FIG. 5 represents a schematic side view of another embodiment in whichthe tapered godet is helically grooved to facilitate yarn separation;

FIG. 6 represents a schematic side view of another embodiment in whichthe rotating tapered driven godet, in conjunction with a tilted rotatingtexturizing element is utilized to facilitate yarn separation;

FIG. 7a and FIG. 7!; represent a schematic view and an end viewrespectively of still another embodiment illustrating the rotatingtexturizing edge tilted in two directions, i.e., in the X and Z axis;

FIG. 8 represents a schematic side view of another embodimentillustrating a pair of rotating texturizing edges and a modifiedrotating driven godet utilizing a tapered flange at one end.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention isdirected to an improvement which affords superior quality and greaterefficiency in the technique of high-speed texturizing of textile yarns,wherein a yarn, while heated under tension, is drawn in frictionalengagement with the texturizing element which imparts a crimp to theyarn; both the yarn and the texturizing element are advanced in the samedirection as the yarn is being texturized. This technique is describedin greater detail in the above-mentioned US. Pat. No. 3,619,874. Thepresent invention substantially obviates the tendency of entanglement orbreakage in this high-speed process. For better particularity, thetexturizing element may also be referred to as knife edge or blade as soused and maybe considered synonymous; however, it will be understoodthat any other suitable texturizing element such as a wire, a plain orknurled bar, file, and the like, may be used as the element with whichthe filament or yarn comes into frictional engagement and is crimped ortexturized. Also, while details of a heater for the yarn blade as shownin the aforementioned U.S. Pat. No. 3,619,874.

Referring to FIG. 1 of the drawing, a schematic arrangement whichcomprises a godet 20 with the desired surface finish 21 mounted on shaft22, a texturizing element 23 and a separator element 27 are shown inoperable relationship to texturize yarn which is passed thereover. Theseparator element or roller may be disposed at any suitable angularposition relative to the texturizing element, i.e., while it is shown atapproximately 180 removed from element 23, it may be located contiguousto the element 23 or 45 or 90 removed, for example. As shown, yarn 29,which is to be texturized, is taken from the yarn supply (not shown)which may comprise a storage bobbin or may be supplied without priorstorage from conventional extruding apparatus (not shown) after suitableroutine pretreatment such as extrusion or drawing of the yarn. The yarn29 is passed through tension regulating device 33 of a kind well knownin the art and is wrapped around the godet 20, which may be eitherheated or cooled, as required, the texturizing element 23, which alsomay be heated or cooled, and optionally the rotating separator element27. Each of the elements 20, 23 and 27 is suitably mounted so thatrotation of the driven godet 20 may be driven at different relativespeeds with respect to the texturizing element 23 (and separator element27 when present). The pair of bearing assemblies 25 and 26 are shownwhich permit shaft 22 to rotate independently from mounting 24 fortexturizing element 23 and mounting 28 for the separator element. Theyarn at 29, after passing one or more times around the assembly ofdriven rotating godet 20, heater (not shown) and texturizing element'23, is withdrawn at 32. Yarn separation is achieved by the tilted angleof rotating element 23 aided optionally by separator element 27.Optionally, yarn separation may also be aided by means of an eccentriccam 34 synchronized with the rotating texturizing element 23 via shaft35 by conventional mechanical means (not shown). As the texturizingelement 23 rotates at some point, yarn 29 is engaged by cam 34 in such amanner that it is held at a position corresponding laterally to the highpoint of the cam 34A furthest away from the prior wrap. As element 23rotates, the yarn moves laterally from 30 to 31. At the same time, thecam rotation permits the yarn entering the process to move to a positioncorresponding to the cams low point 34B. As the element 23 rotates intoposition to engage the entering yarn 29, the cam 34 has rotated to sucha position-that it holds the yarn furthest away from the previous wrap,and the process repeats. A configuration of the texturizing element 23may have several forms, i.e., it may be a knife blade, a wire, or even asquare bar; it may be heated or it may be in contact with, or mountedcontiguously to, a heater to form a rotating heaterblade assembly.Similarly, the separating element 27 may take several forms in additionto the circular one shown. It may have a cross-section which iselliptical or egg-shaped and equipped with various surface frictioncharacteristics. The essential structural parts of the yarnwrap-controlling arrangement resides in the central driven rotatinggodet 20, the heater (not shown) and the rotating texturizing element23. In the process of texturizing, the central driven rotating godet 20and the texturizing element 23 rotate in the same direction but at adifferent angular surface velocity. The driven rotating godet whosesurface 21 may be prepared to control the friction forces on the yarnsupplies the yarn into the texturizing zone and also pulls the yarn awayfrom the texturizing zone. The angle of the texturizing element 23 isappropriately arranged so that the first wrap of yarn 30 is advancedfrom the initial position on the driven rotating godet roll and blade toan advanced position 31, etc., as the arrangement rotates in order toaccommodate a subsequent wrapped yarn without entangling. For a fullerunderstanding of the invention, it is important to note that thetreatment of the yarn by use of a plurality of wraps around a rotatingtexturizing element in accordance with the invention produces a yarnwhich is crimped or textured in sections, that is, with each wrap asegment of the yarn is textured so that to obtain a fully, i.e., percenttextured yarn, it is necessary to synchronize the relative speed betweenthe driven rotating godet and the texturizing element and also to applya suitable number of wraps to produce the desired result. Under theseconditions, the uncrimped portion of the yarn, which has not beenbrought in contact with the texturizing element during the process, canbe crimped on a subsequent wrap or wraps. The length of the crimpposition may be increased by increasing the number of wraps and, indeed,more than 100 percent crimping or superimposed crimping is possible, ifdesired, that is, recrimping an already crimped section. In order toobtain a continuously texturized yarn, the following expression may beused to compute the desired number of wraps n: n velocity ofyarn/(velocity of yarn velocity of blade) As can be seen from thisexpression, the number of wraps required to achieve a complete crimpincreases with the crimping element to yarn velocity ratio and decreaseswith increasing difference between the yarn and crimping elementvelocity. For example, in a process where the yarn speed is on the orderof 3,000 ft./min. and the differential speed between the yarn and bladeis 30 ft./min., the number of wraps required to produce a continuousdesirable level of crimp will be in the order of 100 wraps. Because thedegree of texture produced by passage over the texturizing edge dependson a number of factors, including for example the temperature of theedge, the yarn tension, and the geometry of the edge in contact with theyarn, entrance and exit angles of the yarn with respect to thetexturizing edge, etc., it is necessary to maintain these processingconditions, e.g., temperature, tension, geometry, etc., as constant aspossible over the entire operation so as to apply minimum variation andconditioning from wrap to wrap. Apart from these factors, however, theoverlapping of fibers an/or nonuniform sliding of the yarn from theentrance to the exit portion of the edge considerably hampersconsistently good product processing. The yarn overlapping also leads toyarn breakage which is a serious problem because of the resultingproduction down-time. By use of feed advancing surfaces, as shown by anddescribed in connection with FIG. 1 and by the embodiments shown by thefigures hereinafter described in detail, entanglement of the yarn may besubstantially obviated.

The embodiments shown in FIG. 2 utilizes a godet surface which has avery low coefficient of friction at the entrance zone in order tominimize the chance for overlapping of the initial wraps of the yarn. Inaddition, a low friction zone on the discharge end reduces thepossibility of yarn breaks due to tension increase. Where lowcoefficient of friction surface is employed, the overlapping of thefirst wrap with the other wraps can be either eliminated orsubstantially reduced. As shown in FIG. 2, a rotating driven godet 36mounted on shaft 39 and rotating in bearing 40 which has a low frictionportion 38 and a relatively higher friction surface 37 is utilized. Thedriven rotating godet 36 is suitably mounted so as to rotate on a shaft39 and a crimping element 41 suitably mounted at 42 on the bearing 50which permits the texturizing element 41 to rotate at a differentialspeed around the driven rotating godet 36. The yarn 43 is fed through atension gate 44 and makes several wraps 45, 46, 47 and 48 around thedriven rotating godet 36 and texturizing element 41 and is withdrawn atleast partially texturized at 49. Since the low friction surface of thegodet does not provide a good control of yarn tension and forward motionis necessary, the low friction surface 38 is kept very narrow, thesections of the yarn where the crimping is carried out, however, arewrapped around a relatively higher friction section 37 of the drivenrotating godet to avoid any slippage between the yarn and the godetsurface during texturizing operation. Illustratively, the low frictionarea, i.e., the yarn inlet zone or discharge zone, may be coated with amaterial which provides minimum friction such as polytetrafluoroethylenewhile the higher friction zone may be coated with chrome or with arubbery material for example. In accordance with the invention, theseparation of the yarn to prevent entanglement can be achieved not onlyby an inclined texturizing element, as described in conjunction withFIG. 1 and FIG. 2 or by an inclined tapered godet, as illustrated inconjunction with FIG. 4, but also by a positive driving of the yarnalong the godet as shown in conjunction with FIG. 3 and FIG. 5.

The use of a positive method to keep the yarn separated is shown in FIG.3. The separation of the various wraps of the yarn and lateral movementof the yarn is achieved by means of a direct contact of the yarn with asurface which maintains separation of and guides and advances the wrapsof yarn. As shown schematically in FIG. 3, a yarn separator screw 57,which is provided with helical grooves or threads, is positionedcontiguous to the texturizing element 56. The wraps of yarn travelwithin these helical grooves. The separator screw 57 is arranged torotate only around the godet axis 55 and not around its own axis .62.The godet 54 is suitably mounted in the bearings 61, while the mounting59 for the separator screw 57 and texturizing element 56 rotates in thebearing assembly 60 around bearing assembly 61. It is important to notethat, during the crimping process as the separator screw 57 and blade 56rotate, the separator screw 57 does not revolve around its own axiswhile rotating around the axis of the godet. In other words, while thetexturizing element 56 is constantly disposed away from the godet 54, sothat when the blade 56 has turned 180 degrees from the northerly facingposition as shown in FIG. 3, the blade faces north, a given point on thesurface of separator screw 57 does not rotate in this manner. Instead,while screw 57 has itself turned and is positioned 180 degrees (from theposition shown in FIG. 3) with respect to the axis 55 of godet 54, agiven point on the screw 57 continues to face in a northerly direction.As seen in FIG. 3, an arrangement comprising a timing belt 63 issuitably arranged to connect pulleys 64 and 65, neither of which rotatesabout its axis. Pulley 65 is mounted in a locked position on axis 55, sothat axis 55 rotates within pulley 6S. Pulley 64 is mounted so that itrotates only about the axis 55 of the screw and not about its own axis.It is thus seen that the yarn 67 which is fed through the tension gate68 makes several wraps 69, 70, 71, 72, 73 and 74 around the drivenrotating godet and texturizing element-separator screw assembly and isthen withdrawn as a textured yarn 75. Because of the positive driveafforded by the helical grooves in the separator screw 57, the separatorarrangement of FIG. 3 may be modified so that, instead of the angularly,i.e., tilted, assembly 56 and 57, the texturizing element and separatorscrew may be positioned horizontally as shown in phantom by the elements7.6 and 77, respectively.

Illustrated in FIG. 4 is an embodiment which utilizes a tapered godet80. As seen, the yarn separation and sideways translation of the variouswraps of the yarn is achieved by modifying the profile of the centralgodet. The texturizing element 83 is suitably mounted at 84 on a bearingassembly 85, which is concentrically positioned over bearing assembly 86within which shaft 82 for godet rotates. It is thus seen that, as yarn87 passes through tension gate 88 and over the driven rotating godet andtexturizing element 83, the several wraps 89, 90, 91 and 92progressively move to the right as the godet and the texturizing elementrotate, which in turn substantially eliminates the tendency for overlapand entanglement. The texturized yarn is shown withdrawn at 93. I

The arrangement shown in FIG. 5 utilizes a threaded godet. We have foundthat under conditions where the tendency for overlapping is relativelyhigh (e.g., highdenier multifilament yarn) it may be desirable to keepthe yarn separated physically during a larger segment of each wrap. Thiscan be achieved by threading the godet as shown schematically in FIG. 5.The depth and width of the helical grooves 101 on godet may be varieddepending on the yarn denier and the number of wraps and otherprocessing conditions. It is also ap parent that the use of threadedgodet may be applied to a cylindrical godet as shown in phantom at 102,as well as to a cone-shaped godet 100. In the arrangement shown in FIG.5, the godet is-suitably mounted for rotation on axis 103 set in bearingassembly 107. The texturizing element 104 mounted at 105 is arranged torotate around axis 103 in bearing assembly 106. As shown, yarn 108 isfed through tension gate 109 and wrapped a suitable number of times, twoof which are shown at 110 and 111, around godet 100 and texturizngelement 104 and withdrawn after a suitable number of turns in texturedcondition at 112.

In the embodiment depicted in FIG. 6, a tapered godet, as well as atilted texturizing element, is shown with the angles from horizontalslightly exaggerated for emphasis. It will be apparent that only amoderate departure from the horizontal may suffice depending upon thevariable factors utilized such as tension, temperature, denier of theyarn, etc. The driven rotating godet 120 which may have a plain orgrooved surface 121 is mounted on shaft 122 which is set in bearingassembly 126. Rotating around this axis is texturizing element 123suitably mounted at 124 on bearing assembly 125. The yarn to be crimpedis fed at 127 through tension gate 128 and makes a plurality of wraps129 and 130 around godet 120 and knife 123 and is withdrawn in atextured condition at 131.

In the arrangement of FIG. 7a, the yarn separation is achieved by properinclination and rotation of the texturizing element angle with respectto the godet axis. FIG. 7b shows the end view of the rotating texturizerwhere a and b are the points where the yarn makes initial and finalcontact with the texturizing element which is rotated to the godet axis138. The included angle, alpha, is the angle between the horizontalgodet axis 138 and the angle the axis of the blade element 139 makeswith the horizontal plane. For instance, if alpha equals zero degrees,no yarn separation occurs. If the angle alpha is large, say degrees,good yarn separation is achieved. However, the filaments may be wrappedvery loosely around the driven rotating godet and the texturizingelement. This may result in either poor texturizing performance, i.e.,poor crimp, or yarn breakage. To offset this, it may be desirable topivot the end 150 of texturizing element 139 out of the inclined planewhich it forms with the axis of shaft 138. This may be utilized to takeup any undesirable slack which may occur in the subsequent wraps as theyarn proceeds from left to right as shown in FIG. 7a. FIG. 7b shows theend view of the rotating texturizing element, pointsa and b representingpoints along the texturizing element 139. It is thus seen that yarn fedat 143 through tension gate 144 makes a plurality of wraps over godet136 and texturizing element 139, four wraps 145, 146, 147 and 148 beingshown, and thereafter the texturized product was withdrawn at 149. Thedriven rotating godet 136 is suitably mounted on, axis 138 which rotatesin bearing assembly 142 concentrically mounted on bearing assembly 141for texturizing element support 140.

In the embodiment of FIG. 8, an assembly comprising a driven rotatinggodet 155 provided with flanged portions 156 and 158 and a taperedsegment 159 is used in conjunction with a plurality of texturizingelements, two of which 161 and 162 are shown. The godet is arranged torotate on an axis 157 on bearing assembly 165. The texturizing elementsare arranged in a cage-like assembly so that they are supported at oneend at 166 in the support member 163 which in turn is arranged to bedriven through bearing assembly 164. The cage assembly rotates onbearings 16 and 169 mounted on the rotating godet so that the cage-likeassembly rotates at relatively different speed than the driven rotatinggodet. The other ends of the texturizing elements 161 and 162 aresupported by mounting 167 on bearing 169. A suitable drive for rotatingthe godet 155 and texturizing elements 161 and 162 at relative speeds isshown generally at 176. It is thus seen that yarn fed at 170 throughtension gate 171 passes over the driven rotating godet and texturizingelements contacting the tapered portion 159 which relatively abruptlymoves the yarn to the right thus avoiding entanglement with subsequentwraps until it contacts the horizontal segment or cylindrical portion ofthe godet when it is moved to the right at a more gradual pace by properadjustment of the texturizing elements as indicated previously, threewraps 172, 173 and 174 of the yarn being shown. The textured yarn isremoved at 175.

Various modifications will be apparent to one skilled in the art, and itis not intended that this invention be limited to the details in thespecific drawings and description and by way of illustration. Also,while particulars regarding the drive of the texturizing element and thegodet, as well as the means for hearing the yarn at the texturizingpoint or on the godet, have not been either specified in detail or shownin the figures, such means are set forth in the aforementioned U.S. Pat.No. 3,619,874 and may be applied with appropriate modifications so as toaccommodate the embodiments of the present invention. Accordingly, theinvention is not to be limited, except to the extent necessitated by theexpress recitation of the appended claims.

We claim:

1. In an apparatus for texturizing yarn comprising in combination adriven rotating godet for said yarn and a texturizing element whichrotates around said godet and over which a plurality of wraps of saidyarn moving at a differential speed relative to said element are drawnin frictional engagement, the improvement comprising yarn advancingmeans to transport the yarn laterally over the texturizing surface overwhich said yarn is drawn in frictional engagement, said advancing meanscomprising an elongated texturizing element whose edge is inclined withrespect to the godet axis whereby subsequent wraps of yarn are guidedlaterally away from the feed yarn contact position on said godet andtexturizing element thereby inhibiting overlapping of subsequent wrapsof said yarn during the texturizing operations.

2. The apparatus of claim 1 in which the godet is provided with a yarnadvancing surface in which the coefficient of friction of the initialcontact surface area of the godet is relatively less than thecoefficient of friction of the advanced areas of the godet.

3. The apparatus of claim 1, wherein the means affording the yarnadvancing surface comprises said inclined texturizing element incombination with a tapered godet.

4. The apparatus of claim 1, wherein the means affording the yarnadvancing surface comprises a helically grooved separator screw movingwith the same angular velocity as, and in combination with, thetexturizing element.

5. The apparatus of claim 1, wherein the means affording the yarnadvancing surface comprises a heli- 7. The apparatus of claim 1 in whicha cam is employed to deposit the feed yarn to be texturized at aspecific contact position on said apparatus.

8. The apparatus of claim 1 which includes a separator roll mounted onthe same assembly as the texturizing element and moving with the sameangular velocity as the rotating texturizing element.

9. The apparatus of claim 1, wherein the texturizing element comprises aplurality of texturizing blades mounted in a rotary assembly whichhouses centrally therein the godet.

10. The apparatus of claim 9, wherein the godet is essentiallycylindrical and is provided with a tapered flange upon which the yarnfeed is initiated before it progresses onto said godet.

11. A method for texturizing and advancing yarn by passing a pluralityof wraps of the yarn over a combination of a driven rotating godet and(b) an elongated texturizing element whose rotation is coordinated withthe rotation of (a) but whose linear movement is at a relativelydifferent rate comprising inclining the edge of said texturizing elementso that it approaches the axis of said godet as the yarn is advancedthereby positively advancing said yarn laterally on thegodet-texturizing element assembly so that subsequent wraps of yarn fedonto a given contact position on said combination godet and texturizingelement are progressively ad-

1. In an apparatus for texturizing yarn comprising in combination adriven rotating godet for said yarn and a texturizing element whichrotates around said godet and over which a plurality of wraps of saidyarn moving at a differential speed relative to said element are drawnin frictional engagement, the improvement comprising yarn advancingmeans to transport the yarn laterally over the texturizing surface overwhich said yarn is drawn in frictional engagement, said advancing meanscomprising an elongated texturizing element whose edge is inclined withrespect to the godet axis whereby subsequent wraps of yarn are guidedlaterally away from the feed yarn contact position on said godet andtexturizing element thereby inhibiting overlapping of subsequent wrapsof said yarn during the texturizing operations.
 2. The apparatus ofclaim 1 in which the godet is provided with a yarn advancing surface inwhich the coefficient of friction of the initial contact surface area ofthe godet is relatively less than the coefficient of friction of theadvanced areas of the godet.
 3. The apparatus of claim 1, wherein themeans affording the yarn advancing surface comprises said inclinedtexturizing element in combination with a tapered godet.
 4. Theapparatus of claim 1, wherein the means affording the yarn advancingsurface comprises a helically grooved separator screw moving with thesame angular velocity as, and in combination with, the texturizingelement.
 5. The apparatus of claim 1, wherein the means affording theyarn advancing surface comprises a helically grooved godet incombination with the texturizing element.
 6. The apparatus of claim 1,wherein the means affording the yarn advancing surface comprises atapered and helically grooved godet in combination with the texturizingelement.
 7. The apparatus of claim 1 in which a cam is employed todeposit the feed yarn to be texturized at a specific contact position onsaid apparatus.
 8. The apparatus of claim 1 which includes a separatorroll mounted on the same assembly as the texturizing element and movingwith the same angular velocity as the rotating texturizing element. 9.The apparatus of claim 1, wherein the texturizing element comprises aplurality of texturizing blades mounted in a rotary assembly whichhouses centrally therein the godet.
 10. The apparatus of claim 9,wherein the godet is essentially cylindrical and is provided with atapered flange upon which the yarn feed is initiated before itprogresses onto said godet.
 11. A method for texturizing and advancingyarn by passing a plurality of wraps of the yarn over a combination of adriven rotating godet and (b) an elongated texturizing element whoserotation is coordinated with the rotation of (a) but whose linearmovement is at a relatively different rate comprising inclining the edgeof said texturizing element so that it approaches the axis of said godetas the yarn is advanced thereby positively advancing said yarn laterallyon the godet-texturizing element assembly so that subsequent wraps ofyarn fed onto a given contact position on said combination godet andtexturizing element are progressively advanced from said contactposition until the withdrawal position from said combination therebysubstantially precluding overlapping of said wraps and entanglement ofthe yarn passed over the combination.
 12. The method of claim 11,wherein the yarn is advanced by winding said yarn over a rotatinghelical screw whose axis is essentially in parallel alignment with theaxis of the godet, said screw arranged so that a given point on thesurface of the screw faces in the same direction while the screw rotatesaround the axis of the rotating godet.